Narasimha Jayanti vrat or fast is observed on the fourteenth day of the Shukla Paksha (bright fortnight) in Vaisakha month. According to the gregorian calendar it is celebrated in April / May. It is believed that this day is the birth anniversary of the Lord Narasimha and this year, Narasimha jayanti is on Friday, 25th May 2040.

Narasimha is the fourth incarnation of Lord Vishnu. This is a half human and half loin form of God Vishnu. God appeared in this form to destroy rakshas Hiranyakashipu. Narasimha Jayanti is celebrated in grand manner in God Vishnu and ISCON temples. On this day, devotees observe fast, perform daan and keep vigil in the night.